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À propos ancient Martian architecture... 'Stone Architecture on Mars, Demonstrating Mars' two-thirds less gravity than Earth's' (1956) by Chesley Bonestell [Published in: Ley & Von Braun's 'The Exploration of Mars', 1956, p. 66, as plate x]
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'Soviet Union 6 kopeks stamp, 1972. 15 Years of Space Age. Mars' ['Марка, Советский Союз, 6 копеек, 1972. 15 лет космической эры. Марс']
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